FDA Policy Supports the Use of Gruenberg Dry Heat Sterilizers to Process N95 Respirators

Posted: Apr 26, 2021

Gruenberg, a division of Thermal Product Solutions (TPS, LLC) is pleased to announce that the recent FDA egruenberg ovennforcement policy supports the use of Gruenberg dry heat sterilizers for bioburden reduction on N95 respirators during the Coronavirus (COVID-19) public health emergency. The FDA guidance document [1] supports the use of dry heat processing to reduce the risk of transmission of the SARS-CoV-2 virus and supports limited reuse of NIOSH approved Filtering Facepiece Respirators. 

The FDA policy states that “Based on currently available evidence, dry heat at T = 75 °C for t=30 minutes should reliably achieve ≥ 3-log reduction in non-enveloped virus or vegetative bacteria on respirators.”  This reduction level corresponds to a 99.9% elimination of the stated bioburdens. The policy goes on to state that “Based on currently available evidence, dry heat at T = 75 °C for 30 minutes should not affect the filtration efficiency, breathability, and fit of respirators.”

Microbiological testing performed for TPS, LLC by an independent laboratory confirmed achievement of the minimum 3-log (99.9%) bioburden reduction (BBR) stated in the FDA policy.  In addition, samples of thegruenberg sterilizer processed respirators were sent to NIOSH, where they were independently evaluated. The NIOSH test reports confirmed that the N95 filtration efficiency and fit testing scores were not significantly affected after 10 cycles of Dry Heat processing.

Numerous models of Gruenberg sterilizers can be quickly reprogrammed to run the TPS BBR Cycle, making the systems immediately available for processing respirators. Use of the TPS Dry Heat BBR process is intended to support the single-user reuse of compatible N95 respirators, as a supplement to existing CDC reuse recommendations.

“All of us here at Gruenberg are proud to be supplying equipment that is being used in the fight against COVID-19. This recent FDA policy supports the use of our products to extend the usage of N95 masks and assist with reducing the shortage of vital PPE resources.”sterilized mask
– Mike Schneck, Gruenberg Product Manager




[1] Enforcement Policy for Bioburden Reduction Systems Using Dry Heat to Support Single-User Reuse of Certain Filtering Facepiece Respirators During the Coronavirus Disease 2019 (COVID-19) Public Health Emergency | FDA


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